maually remove warning, pt4

kernel/build.rs

@@ -22,6 +22,7 @@ fn main() {
 				.file("src/arch/riscv32/compiler_rt.c")
 				.flag("-march=rv32ia")
 				.flag("-mabi=ilp32")
+    			.flag("-Wno-builtin-declaration-mismatch")
 				.compile("atomic_rt");
 			if let Ok(file_path) = gen_sfsimg_asm() {
 				cc::Build::new()

kernel/src/arch/riscv32/compiler_rt.c

@@ -6,7 +6,7 @@ int __atomic_load_4(int *src) {
     return res;
 }
 
-int __atomic_store_4(int *dst, int val) {
+void __atomic_store_4(int *dst, int val) {
     __asm__ __volatile__("amoswap.w.aq zero, %0, (%1)" :: "r"(val), "r"(dst) : "memory");
 }
 

kernel/src/arch/riscv32/consts.rs

@@ -1,6 +1,8 @@
 // Physical address available on THINPAD:
 // [0x80000000, 0x80800000]
+#[allow(dead_code)]
 const P2_SIZE: usize = 1 << 22;
+#[allow(dead_code)]
 const P2_MASK: usize = 0x3ff << 22;
 pub const RECURSIVE_INDEX: usize = 0x3fe;
 pub const KERNEL_OFFSET: usize = 0;

kernel/src/arch/riscv32/context.rs

@@ -155,7 +155,7 @@ impl Context {
     /// Pop all callee-saved registers, then return to the target.
     #[naked]
     #[inline(never)]
-    pub unsafe extern fn switch(&mut self, target: &mut Self) {
+    pub unsafe extern fn switch(&mut self, _target: &mut Self) {
         asm!(
         "
         // save from's registers
@@ -241,7 +241,7 @@ impl Context {
     * @retval:
     *   a Context struct with the pointer to the kernel stack top - 1 as its only element
     */
-    pub unsafe fn new_user_thread(entry_addr: usize, ustack_top: usize, kstack_top: usize, is32: bool, cr3: usize) -> Self {
+    pub unsafe fn new_user_thread(entry_addr: usize, ustack_top: usize, kstack_top: usize, _is32: bool, cr3: usize) -> Self {
         InitStack {
             context: ContextData::new(cr3),
             tf: TrapFrame::new_user_thread(entry_addr, ustack_top),

kernel/src/arch/riscv32/cpu.rs

@@ -1,6 +1,5 @@
 use crate::consts::MAX_CPU_NUM;
 use core::ptr::{read_volatile, write_volatile};
-use crate::memory::*;
 
 static mut STARTED: [bool; MAX_CPU_NUM] = [false; MAX_CPU_NUM];
 

kernel/src/arch/riscv32/interrupt.rs

@@ -12,7 +12,6 @@ use riscv::register::{
 };
 use riscv::register::{mcause, mepc, sie};
 pub use self::context::*;
-use crate::memory::{MemorySet, InactivePageTable0};
 use log::*;
 
 #[path = "context.rs"]

kernel/src/arch/riscv32/io.rs

@@ -56,5 +56,6 @@ pub fn putfmt(fmt: Arguments) {
 
 const DATA: *mut u8 = 0x10000000 as *mut u8;
 const STATUS: *const u8 = 0x10000005 as *const u8;
+#[allow(dead_code)]
 const CAN_READ: u8 = 1 << 0;
 const CAN_WRITE: u8 = 1 << 5;

kernel/src/arch/riscv32/memory.rs

@@ -1,8 +1,8 @@
-use core::{slice, mem};
+use core::mem;
 use riscv::{addr::*, register::sstatus};
 use ucore_memory::PAGE_SIZE;
 use log::*;
-use crate::memory::{active_table, FRAME_ALLOCATOR, init_heap, MemoryArea, MemoryAttr, MemorySet, MEMORY_ALLOCATOR, Linear};
+use crate::memory::{FRAME_ALLOCATOR, init_heap, MemoryAttr, MemorySet, Linear};
 use crate::consts::{MEMORY_OFFSET, MEMORY_END};
 
 #[cfg(feature = "no_mmu")]
@@ -94,6 +94,7 @@ fn remap_the_kernel() {
 static mut SATP: usize = 0;
 
 // Symbols provided by linker script
+#[allow(dead_code)]
 extern {
     fn stext();
     fn etext();

kernel/src/arch/riscv32/mod.rs

@@ -16,7 +16,7 @@ pub extern fn rust_main(hartid: usize, dtb: usize, hart_mask: usize, functions:
     if hartid != 0 {
         while unsafe { !cpu::has_started(hartid) }  { }
         others_main();
-        unreachable!();
+        //other_main -> !
     }
 
     crate::logging::init();

kernel/src/arch/riscv32/paging.rs

@@ -6,8 +6,6 @@ use riscv::asm::{sfence_vma, sfence_vma_all};
 use riscv::paging::{Mapper, PageTable as RvPageTable, PageTableEntry, PageTableFlags as EF, RecursivePageTable};
 use riscv::paging::{FrameAllocator, FrameDeallocator};
 use riscv::register::satp;
-use ucore_memory::memory_set::*;
-use ucore_memory::PAGE_SIZE;
 use ucore_memory::paging::*;
 use log::*;
 
@@ -71,7 +69,7 @@ impl PageTable for ActivePageTable {
     */
     fn unmap(&mut self, addr: usize) {
         let page = Page::of_addr(VirtAddr::new(addr));
-        let (frame, flush) = self.0.unmap(page).unwrap();
+        let (_, flush) = self.0.unmap(page).unwrap();
         flush.flush();
     }
 
@@ -154,7 +152,7 @@ impl Entry for PageEntry {
     fn execute(&self) -> bool { self.0.flags().contains(EF::EXECUTABLE) }
     fn set_execute(&mut self, value: bool) { self.0.flags_mut().set(EF::EXECUTABLE, value); }
     fn mmio(&self) -> bool { false }
-    fn set_mmio(&mut self, value: bool) { }
+    fn set_mmio(&mut self, _value: bool) { }
 }
 
 #[derive(Debug)]